CN108466522A - A kind of manual attaching/detaching apparatus of large size wheel - Google Patents

Abstract

The invention provides a large wheel manual dismounting device. The device includes: a U-shaped base, the U-shaped base is composed of two cantilevers vertically and symmetrically fixed at both ends of the beam, the U-shaped base is connected with the hydraulic lifting device, and the beam is provided with two sliding arms with adjustable spacing. The arm is parallel to the cantilever, and there is a rotating roller on the inside of the sliding arm. There is a tie rod bracket at the connection between the cantilever and the cross beam. There is a vertical tie rod inside the tie rod bracket. The vertical tie rod is free to expand and contract in the tie rod bracket. , The tie rod fixing sleeve is provided with an L-shaped tie rod. The large-scale wheel manual dismounting device provided by the embodiment of the present invention, the wheel axial positioning and circumferential positioning components installed on the U-shaped base, and the U-shaped base can be lifted by the hydraulic lifting device, without the need for external power , to realize the disassembly, installation and handling of large wheels by one person, the operation process is safe and convenient, and can be used for assembly line assembly, maintenance station maintenance and outdoor use.

Description

A large wheel manual dismounting device

technical field

The present invention relates to the technical field of wheel equipment, more specifically, to a large wheel manual dismounting device.

Background technique

The installation and disassembly of wheels is an important link in the manufacture, assembly and maintenance of medium and large vehicles such as tractors and combines, while agricultural machinery maintenance service stations have to complete the installation and disassembly of dozens or dozens of large wheels every day. The installation and disassembly method of the wheel directly affects the assembly efficiency of the production line and the convenience of maintenance.

At present, domestic tractor and harvester assembly factories mostly use hoisting lines to transport large tires. The assembling personnel operate the hoisting line console to control the tires to the best installation position, and then the assembling personnel align the suspended tires with the wheel hubs, and finally fix the wheels .

The whole installation process is operated by assemblers based on experience and manpower, resulting in a large space occupation, heavy labor load, and low work efficiency; maintenance personnel and agricultural machinery users mostly rely on manpower to repair and replace wheels without any auxiliary devices, which is difficult Large, time-consuming and labor-intensive, and has certain risks.

Contents of the invention

Aiming at the problems existing in the prior art, an embodiment of the present invention provides a large wheel manual dismounting device.

The embodiment of the present invention provides a large wheel manual dismounting device, including: a U-shaped base, the U-shaped base is composed of two cantilever arms vertically and symmetrically fixed at both ends of the beam, and the U-shaped base is connected with a hydraulic lifting device ;

The crossbeam is provided with two sliding arms with adjustable spacing, the sliding arms are parallel to the cantilever, and the inner side of the sliding arms is provided with rotating rollers, and the target wheel rotates on the rotating rollers to achieve circumferential positioning;

The connection between the cantilever and the beam is provided with a tie rod bracket, and a vertical tie rod is arranged in the tie rod bracket, and the vertical tie rod is freely telescopic in the tie rod bracket, and a horizontal tie rod fixing sleeve is provided on the top of the vertical tie rod. The axis of the tie rod fixing sleeve is parallel to the cantilever, and the tie rod fixing sleeve is provided with an L-shaped tie rod, and the L-shaped tie rod is used to extend into the inner side of the target wheel to achieve alignment with the axis of the target wheel. orientation.

Preferably, a pull rod bracket folding mechanism is fixed on the cantilever for installing the pull rod bracket, the pull rod bracket is hinged to the pull rod bracket folding mechanism, and the pull rod bracket is erected and folded through the pull rod bracket folding mechanism, When the tie rod bracket is folded, it is parallel to the beam.

Preferably, the beam is provided with a plurality of sliding arm limiting holes, and the sliding arms are installed in different sliding arm limiting holes according to the size of the target wheel.

Preferably, the hydraulic lifting device includes a hydraulic assembly, the hydraulic assembly is fixedly connected to the middle of the beam, the hydraulic assembly is connected with a hydraulic connecting rod, and the hydraulic connecting rod is provided with a handle and a pressure relief handle, by reciprocatingly pressing the handle to realize the rise of the U-shaped base, pulling the pressure relief handle to realize the decline of the U-shaped base, a steering wheel is provided under the hydraulic assembly, and a steering wheel is provided under the end of the cantilever. A traveling wheel is provided, and the traveling wheel is connected with the cantilever through a foldable bracket.

Preferably, a vertical tie rod fixing handle is provided on the tie rod bracket, the vertical tie rod fixing handle is perpendicular to the tie rod bracket, and the vertical tie rod fixing handle is used to fix the vertical tie rod; There is a tie rod fixing handle, the tie rod fixing handle is perpendicular to the tie rod fixing sleeve, and the tie rod fixing handle is used for fixing the L-shaped tie rod.

Preferably, the folding mechanism of the pull rod bracket includes two supports, a short rod and two locking springs, and the movement tracks of the short rods are symmetrically arranged on the two supports, and the pull rod bracket is connected to the support close to the beam through a pin. The seat controls the position of the short rod in the moving track of the short rod through the clamping spring.

The large-scale wheel manual dismounting device provided by the embodiment of the present invention realizes the circumferential positioning of the target wheel through the rotating rollers installed on the U-shaped base, and simultaneously realizes the axial positioning of the target wheel by installing the vertical tie rod and the L-shaped tie rod assembly , keep the wheels perpendicular to the ground, and use the hydraulic lifting device to realize the lifting of the U-shaped base. Without the need for external power, one person can complete the disassembly, installation and transportation of large wheels. The operation process is safe and convenient, and can be used for Production line assembly, service station repair, and outdoor use.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are For some embodiments of the present invention, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural view of a large wheel manual dismounting device according to an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a large wheel manual dismounting device in a folded state according to an embodiment of the present invention;

Reference signs:

1- sliding arm; 2- rotating roller; 3- sliding arm limit hole;

4-walking wheels; 5-foldable bracket; 6-steering wheels;

7-cantilever; 8-tie rod bracket folding mechanism; 9-short rod;

10-Position spring; 11-U-shaped base; 12-Tie bar bracket;

13- vertical tie rod fixed handle; 14- vertical tie rod; 15- horizontal tie rod fixed handle;

16- tie rod fixing sleeve; 17- tie rod operating handle; 18- pressure relief handle;

19-handle; 20-hydraulic connecting rod; 21-hydraulic jack;

22-hydraulic assembly; 23-L type tie rod; 24-sliding arm fixing nut;

25 - Beam.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Fig. 1 is a schematic structural view of a large-scale wheel manual dismounting device according to an embodiment of the present invention. As shown in Fig. 7 are vertically and symmetrically fixed on both ends of the beam 25, and the U-shaped base 11 is connected with the hydraulic lifting device to realize lifting; the beam 25 is provided with two adjustable sliding arms 1, and the sliding arm 1 is parallel to the cantilever 7. The inner side of the slide arm 1 is provided with a rotating roller 2, and the target wheel rotates on the rotating roller 2 to realize circumferential positioning; the connection between the cantilever 7 and the beam 25 is provided with a tie rod bracket 12, and the tie rod bracket 12 is provided with a vertical tie rod 14, and the vertical tie rod 14 is free to expand and contract in the tie rod bracket 12, and the top of the vertical tie rod 14 is provided with a tie rod fixing sleeve 16. Adjust the positions of the vertical tie rods 14 and the L-shaped tie rods 23 to achieve the axial positioning of the target wheel.

Specifically, to realize the disassembly and assembly of the wheels, the circumferential and axial positioning of the wheels is required to keep the wheels perpendicular to the ground, which is convenient for disassembly and installation. The circumferential positioning part of the target wheel mainly includes two sets of sliding arms 1 and the corresponding rotating rollers 2 arranged on the sliding arms 1. The angles of the rotating rollers 2 are inclined to the inner side of the respective sliding arms 1, forming a V-shaped structure, which is convenient for placing the wheels. , and the angle of the rotating roller 2 can be adjusted adaptively according to the size of the wheel, the sliding arm 1 and the crossbeam 25 are perpendicular to each other and have clearance fit, so that the sliding arm can slide horizontally along the crossbeam. The axial positioning part of the target wheel mainly includes a vertical tie rod 14 and an L-shaped tie rod 23. The vertical tie rod 14 is installed in the vertical tie rod support 12. The vertical tie rod support 12 is in a vertical state, and the vertical tie rod 14 is free in the vertical tie rod support 12. Telescopic to realize the height adjustment of the vertical tie rod 14 so that the L-shaped tie rod 23 can extend into the inner side of the target tires of different sizes. The tie rod fixing sleeve 16 is arranged parallel to the cantilever 7 . And the L-shaped tie rod 23 can realize directional sliding and free rotation in the tie-rod fixed sleeve 16, and determine the position of the vertical tie rod 14 and the L-shaped tie rod 23 according to the size of the dismounting wheel to realize axial positioning.

When removing the wheel, lift the mechanical jack of the target wheel about 5cm from the ground, remove the fixing nuts on the wheel and the hub, first adjust the positions of the two sliding arms 1 on the crossbeam 25 according to the diameter of the wheel, and pass the sliding The arm fixing nut 24 is fixed. Because the whole U-shaped base 11 is fixedly connected with the hydraulic lifting device, the overall rise of the U-shaped base 11 is realized by adjusting the hydraulic lifting device, and the height of the U-shaped base 11 and its rotating roller 2 is adjusted by the hydraulic lifting device according to the height of the target wheel from the ground. Height above the ground so that the rotating roller 2 is tangent to the target wheel. According to the height of the target wheel from the ground, adjust the height of the vertical tie rod 14 and lock the height, turn the L-shaped tie rod 23 to a suitable angle through the tie rod operating handle 17 until it can extend into the inner side of the target wheel, then turn and pull the L-shaped tie rod 23 backward, Make the front end close to the rim of the inner tire of the target wheel, pull the entire disassembly device backward, and dismantle the target wheel from the hub to the device.

When installing the wheel, stand the wheel on the rotating roller 2, adjust the height of the whole device and the upper wheel from the ground through the hydraulic lifting device, so that the axis of the center hole of the target wheel is roughly equal to the axis of the hub. Push the whole device to the wheel hub and adjust the height of the target wheel from the ground until the target wheel is installed on the wheel hub, and then rotate the wheel with the help of 2 rotating rollers, so that the target wheel is aligned with the threaded hole on the wheel hub. Adjust the position of the vertical tie rod 14 and the L-shaped tie rod 23, turn and adjust the L-shaped tie rod 23 to a suitable angle, make the front end of the L-shaped tie rod 23 close to the rim of the inner tire of the wheel, and respectively place the L-shaped tie rod 23 and The vertical tie rod 14 is locked in position to ensure that the wheels are perpendicular to the ground. After the threaded holes are aligned, bolt the target wheel to the hub. Adjust the hydraulic lifting device so that the entire assembly and disassembly device falls back to the lowest point. Rotate the L-shaped tie rod 23 so that the target wheel does not block the front end of the L-shaped tie rod 23 and withdraws. Pull the L-shaped tie rod 23 backward, so that the whole dismounting device is withdrawn from the bottom of the wheel, and the installation of the wheel is completed.

The large-scale wheel manual dismounting device provided by the above embodiment, through the wheel axial positioning and circumferential positioning components installed on the U-shaped base, combined with the lifting of the U-shaped base, realizes a single The disassembly and installation of large wheels can be completed by one person. The operation process is safe and convenient. It can be used for production line assembly, repair station maintenance and outdoor use.

On the basis of the above-mentioned embodiment, the cantilever that is used to install the pull rod support 12 is fixed with a pull rod support folding mechanism 8, and the pull rod support 12 is hinged on the pull rod support folding mechanism 8, and the pull rod support 12 is erected and closed by the pull rod support folding mechanism 8. When folded, the rod support 12 is parallel to the beam 25 when folded.

Specifically, in order to save space and facilitate vehicle-mounted and outdoor use, the rod support 12 is designed as a foldable structure. Pull bar support folding mechanism 8 is installed on the cantilever 7 in parallel, and pull bar support 12 is hinged with pull bar support folding mechanism 8 by pin, and pull bar support 12 is positioned at the junction of this cantilever 7 and crossbeam 25, and pull bar support 12 is controlled by pull bar support folding mechanism 8 When the tie rod bracket 12 is upright, it is used for the disassembly and installation of the target wheel. When the installation is not in use, the tie rod bracket 12 and the vertical tie rod 14 and L-shaped tie rod 23 installed on it are folded. At this time The rod support 12 is parallel to the beam 25 .

The large wheel manual dismounting device provided by the above embodiment controls the upright and folding of the axial positioning parts through the rod bracket folding device, which is beneficial to save space and is convenient for vehicle and outdoor use.

On the basis of the above-mentioned embodiments, the beam 25 is provided with a plurality of sliding arm limiting holes 3, and the sliding arm 1 is installed in different sliding arm limiting holes 3 according to the size of the target wheel.

Specifically, a plurality of sliding arm limit holes 3 are provided on the beam 25 of the U-shaped base, and a mounting hole with the same size as the sliding arm limiting hole 3 is provided on the sliding arm 1. The mounting hole of the sliding arm 1 is connected to the cross beam. The sliding arm limit hole 3 on 25 is corresponding and fixed by the sliding arm fixing nut 24. The two sliding arms 1 are adjusted in the same way, and can be combined into a variety of different spacing combinations to meet the needs of tires of different sizes. .

On the basis of the above-mentioned embodiments, the hydraulic lifting device includes a hydraulic assembly 22, the hydraulic assembly 22 is fixedly connected to the middle of the beam 25, the hydraulic assembly 22 is connected with a hydraulic connecting rod 20, and the hydraulic connecting rod 20 is provided with a handle 19 And the pressure relief handle 18, the lower part of the hydraulic connecting rod 20 is also provided with a pressure relief pedal, the rise of the U-shaped base 11 is realized by reciprocatingly pressing the handle 19, and the U-shaped base is lowered by pulling the pressure relief handle 18 or stepping on the pressure relief pedal. A steering wheel 6 is arranged below the hydraulic assembly 22 , and a traveling wheel 4 is arranged below the end of the cantilever 7 , and the traveling wheel 4 is connected with the cantilever 7 through a foldable bracket 5 .

Specifically, the hydraulic lifting device is used to realize the lifting of the U-shaped base. In this embodiment, the conventional hydraulic assembly 22 is used to realize the lifting of the U-shaped base 11. The hydraulic assembly 22 is fixedly connected with the middle part of the crossbeam 25. Folding support 5 is adapted to the lifting of crossbeam 25, guarantees that each position of whole device is in horizontal state. The hydraulic assembly 22 is connected with a hydraulic connecting rod 20, the hydraulic connecting rod 20 is provided with a handle 19 and a pressure relief handle 18, the pressure relief handle 18 is arranged on the handle 19, and the steering wheel 6 and the cantilever 7 are arranged under the hydraulic assembly 22 The bottom of the end is provided with a road wheel 4, and the road wheel 4 is connected with a cantilever 7 through a foldable bracket 5. The hydraulic assembly 22 is fixedly connected with the U-shaped base through the hydraulic jack 21 . The hydraulic assembly 22 is also provided with a pressure relief pedal, which has the same function as the pressure relief handle 18, and is used to relieve the pressure of the hydraulic assembly 22 after the installation is completed, so that the whole device is lowered.

Referring to Figure 1, when removing the wheel, lift the machine where the target wheel is located with a jack about 5cm from the ground, remove the fixing nuts on the wheel and the hub, and first adjust the positions of the two sliding arms 1 on the beam 25 according to the diameter of the wheel , and fixed by the sliding arm fixing nut 17. Since the entire U-shaped base 11 is fixedly connected with the hydraulic lifting device, by continuously pressing the handle 19 to apply pressure to the hydraulic cylinder, the hydraulic jack 21 on the hydraulic assembly 22 drives the entire U-shaped base to rise to realize the beam 25 and the rotating roller 2 on it. The height above the ground makes the rotating roller 2 tangent to the target wheel, and the foldable support 5 resets and expands simultaneously, so that the cantilever 7 rises with the crossbeam 25 and maintains the same height. According to the height of the target wheel from the ground, adjust the height of the vertical tie rod 14 and lock the height. In order to facilitate operation, a tie rod operating handle 17 is provided at the end of the straight rod of the L-shaped tie rod, and the L-shaped tie rod 23 is rotated to a suitable angle through the tie rod operating handle 17 until it can extend into the inner side of the target wheel, and then rotate and pull it backward L tie rod 23 makes its front end close to the tire rim place inside the target wheel, pulls the whole dismounting device backwards, and the target wheel is dismantled on the device from the wheel hub.

With reference to Fig. 2, when installing the wheel, stand the wheel on the rotating roller 2, adjust the whole device and the ground clearance of the target wheel on the target wheel by repeatedly pressing the handle 19 downward through the hydraulic pressure 21 on the hydraulic assembly 22, so that the target wheel The axis of the center hole of the wheel is approximately equal to the axis of the hub. The whole device is pushed to the wheel hub by the handle 19 and the height of the target wheel is adjusted from the ground until the target wheel is installed on the wheel hub, and then the target wheel is rotated by the rotating roller 2 manpower, so that the target wheel is aligned with the threaded hole on the wheel hub. Adjust the position of the vertical tie rod 14 and the L-shaped tie rod 23, turn and adjust the L-shaped tie rod 23 to a suitable angle, make the front end of the L-shaped tie rod 23 close to the rim of the inner tire of the wheel, and respectively place the L-shaped tie rod 23 and The vertical tie rod 14 is locked in position to ensure that the wheels are perpendicular to the ground. After the threaded holes are aligned, bolt the wheel to the hub. Press the pressure relief handle 18 or step on the pressure relief pedal to make the whole dismounting device fall back to the lowest point, while the foldable support 5 is folded so that the cantilever 7 descends with the crossbeam 25 and maintains the same height. Rotate the L-shaped tie rod 23 so that the target wheel does not block the front end of the L-shaped tie rod 23 and withdraws. Pull the whole device back simultaneously by means of the handle 19 and the tie rod operating handle 11, so that the whole dismounting device is withdrawn from the bottom of the wheel, and the installation of the wheel is completed.

The large wheel manual dismounting device provided in the above embodiment realizes lifting by means of the installed wheel axial positioning and circumferential positioning components, combined with the hydraulic lifting assembly, and realizes the completion of the large wheel by one person without external power. The disassembly, installation and handling are safe and convenient, and can be used for production line assembly, repair station maintenance and outdoor use.

On the basis of the above-mentioned embodiments, the tie rod bracket 12 is provided with a vertical tie rod fixing handle 13 for fixing the vertical tie rod 14, the vertical tie rod fixing handle 13 vertically passes through the tie rod bracket 12 and contacts with the vertical tie rod 14, and the tie rod fixing sleeve 16 A tie rod fixing handle 15 for fixing the L-shaped tie rod 23 is provided on the top, and the tie rod fixing handle 15 vertically passes through the tie rod fixing sleeve 16 and contacts the L-shaped tie rod 23 .

Specifically, the positions of the vertical tie rods 14 and the L-shaped tie rods 23 are all adjustable, and the positions of the vertical tie rods 14 and the L-shaped tie rods 23 are determined according to the size of the target wheel. The vertical tie rods fixed handle 13 is perpendicular to the vertical tie rods 14. The vertical tie rod fixing handle 13 locks and fixes the vertical tie rod 14, the tie rod fixing handle 15 is perpendicular to the tie rod fixing sleeve 16, and the L-shaped tie rod 23 is locked and fixed by turning the tie rod fixing handle 15, so as to realize the axial direction of the target wheel. position.

On the basis of the above-mentioned embodiments, the folding mechanism of the pull rod bracket includes two supports, a short rod 9 and two locking springs 10. The short rod movement tracks are symmetrically arranged on the two supports, and the pull rod bracket 12 is connected by a pin. On the support close to the crossbeam 25, the position of the short rod 9 in the short rod movement track is controlled by the clamping spring 10. Specifically, when the short rod 9 is stepped on, the locking spring 10 is elongated, and the short rod 9 is at the bottom end of the short rod movement track, so that the pull rod bracket 12 rotates at a certain angle in the support; when the short rod 9 is released, the clamping The bit spring 10 resets, and the short bar 9 is at the top of the short bar moving track, and the short bar 9 blocks the pull bar support 12 so that it cannot rotate in the support, so that the pull bar support 12 is in the position of the upright state or the folded state.

The large wheel manual dismounting device provided by the embodiment of the present invention uses the wheel axial positioning and circumferential positioning components installed on the U-shaped base, and realizes the lifting of the U-shaped base through a hydraulic lifting device. It realizes the disassembly, installation and transportation of large wheels by one person. The operation process is safe and convenient. It can be used for production line assembly, repair station maintenance and outdoor use.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (6)

1. A large-scale wheel manual dismounting device, characterized in that it includes: a U-shaped base, the U-shaped base is composed of two cantilevers vertically and symmetrically fixed on the two ends of the beam, the U-shaped base and the hydraulic lifting device connection; the crossbeam is provided with two sliding arms with adjustable spacing, the sliding arms are parallel to the cantilever, and the inner side of the sliding arms is provided with rotating rollers, and the target wheel rotates on the rotating rollers to achieve circumferential Positioning; the connection between the cantilever and the beam is provided with a tie rod bracket, and a vertical tie rod is arranged in the tie rod bracket, and the vertical tie rod is freely telescopic in the tie rod bracket, and a horizontal tie rod is fixed on the top of the vertical tie rod The axis of the tie rod fixing sleeve is parallel to the cantilever. The tie rod fixing sleeve is provided with an L-shaped tie rod, and the L-shaped tie rod is used to extend into the inner side of the target wheel to achieve the target wheel. Axial positioning. 2. The large wheel manual dismounting device according to claim 1, characterized in that, the cantilever for installing the pull rod bracket is fixed with a pull rod bracket folding mechanism, and the pull rod bracket is hinged with the pull rod bracket folding mechanism, The upright and folding of the pull rod support is realized by the pull rod support folding mechanism, and the pull rod support is parallel to the cross beam when folded. 3. The large wheel manual dismounting device according to claim 1 or 2, characterized in that the beam is provided with a plurality of sliding arm limit holes, and the sliding arms are installed in different positions according to the size of the target wheel. in the limit hole of the sliding arm. 4. The large wheel manual dismounting device according to claim 1 or 2, characterized in that the hydraulic lifting device includes a hydraulic assembly, the hydraulic assembly is fixedly connected to the middle of the beam, and the hydraulic assembly A hydraulic connecting rod is connected to the hydraulic connecting rod, and a handle and a pressure relief handle are provided on the hydraulic connecting rod. By reciprocating pressing the handle, the U-shaped base can be raised, and the pressure-relieving handle is pulled to realize the U-shaped base. When descending, a steering wheel is arranged under the hydraulic assembly, and a traveling wheel is arranged under the end of the cantilever, and the traveling wheel is connected with the cantilever through a foldable bracket. 5. The large wheel manual dismounting device according to claim 1 or 2, characterized in that, the tie rod bracket is provided with a vertical tie rod fixed handle, the vertical tie rod fixed handle is perpendicular to the tie rod bracket, and the vertical pull rod The tie rod fixing handle is used to fix the tie rod; the tie rod fixing sleeve is provided with a tie rod fixing handle, the tie rod fixing handle is perpendicular to the tie rod fixing sleeve, and the tie rod fixing handle is used to fix the tie rod Describe the L-shaped tie rod. 6. The large wheel manual dismounting device according to claim 2, characterized in that, the folding mechanism of the pull rod bracket comprises two supports, a short rod and two locking springs, and the two supports are symmetrically arranged with The short rod movement track, the pull rod bracket is connected to the support close to the crossbeam through a pin, and the position of the short rod in the short rod movement track is controlled by the clamping spring.